Frappe Builder versions 1.33.0 before1.36.0 contain a missing authorization vulnerability in the improve_prompt endpoint that allows any authenticated non-Guest session to invoke LLM completions without proper permission checks. Attackers can call the improve_prompt API to leverage the site owner's stored OpenRouter API key via resolve_api_key, consuming paid LLM credits and effectively turning the site into a free LLM proxy.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
frappe builder unaffected
Version Status Constraints
1.33.0 affected < 1.36.0

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No data.

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Project Subscriptions

Vendors Products
Frappe Subscribe
Builder Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/frappe/builder/releases/tag/v1.36.0 cve-icon cve-icon
https://github.com/frappe/builder/security/advisories/GHSA-58mj-c563-p78w cve-icon cve-icon
https://www.vulncheck.com/advisories/frappe-builder-before-missing-authorization-via-improve-prompt cve-icon cve-icon
History

Mon, 26 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
Description Frappe Builder versions 1.33.0 before1.36.0 contain a missing authorization vulnerability in the improve_prompt endpoint that allows any authenticated non-Guest session to invoke LLM completions without proper permission checks. Attackers can call the improve_prompt API to leverage the site owner's stored OpenRouter API key via resolve_api_key, consuming paid LLM credits and effectively turning the site into a free LLM proxy.
Title Frappe Builder 1.33.0 before 1.36.0 Missing Authorization via improve_prompt
First Time appeared Frappe
Frappe builder
Weaknesses CWE-862
CPEs cpe:2.3:a:frappe:builder:*:*:*:*:*:*:*:*
Vendors & Products Frappe
Frappe builder
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-26T11:45:39.586Z

Reserved: 2026-10-23T11:13:54.116Z

Link: CVE-2026-115718

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-26T12:17:05.387

Modified: 2026-10-26T12:17:05.387

Link: CVE-2026-115718

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-26T13:30:08Z

Weaknesses